change the fluid amount in inflow
Another issue that you will likely encounter, is that your tube obstacle impinges itself in at least 2 places where there is a sharp bend.
The fluid simulator requires a well defined inside versus outside surface to function properly.
Also, you may need to increase the resolution to get a proper result.

In addition to Serge L's recommendations, you could try reducing the gravity setting under the Scene tab. Also, you don't show your obstacle settings. If the ends of the tube are open, the Volume Initialization should be set to 'Shell' and you may also want to adjust the amount of slip.